In order to have consistent and effective braking over the entire RPM range, it is important (and necessary) to maintain constant backpressure. To achieve this, Pacbrake’s patented design has incorporated an additional waste gate on the butterfly valve to regulate the amount of exhaust flow that is being passed through. The flow is controlled by a spring-loaded arm, whose pressure rating and location are key factors in the functionality of the PRXB. Located outside of the housing and away from the heat, the spring is able to maintain its strength and durability for years of proper and precise braking performance.

Pacbrake PRXB Cut-A-Way

GM Trucks with Automatic Transmissions (LB7/LLY/LBZ)

2001-2007

APPLICATION DESCRIPTION PART SWITCHPAC (OPTIONAL)

2001-2005

6.6L Duramax without optional 2nd alternator

InLineMount 4" PRXB High Performance Exhaust Brake Kit (Air Acutated). Comes with Air Tank, Hose, & Accessories. C40075 N/A

2001-2005

6.6L Duramax with optional 2nd alternator

InLineMount 4" PRXB High Performance Exhaust Brake Kit (Air Actuated). Comes with Air Tank, Hose, & Accessories. C40076 N/A

2006-2007

Classic 6.6L Duramax without optional 2nd alternator

InLineMount 4" PRXB High Performance Exhaust Brake Kit (Air Actuated). Comes with Air Tank, Hose, & Accessories. C40070 N/A

2005-2007

Classic 6.6L Duramax with optional 2nd alternator

InLineMount 4" PRXB High Performance Exhaust Brake Kit (Air Actuated). Comes with Air Tank, Hose, & Accessories. C40071 N/A

NOTE: All above kits are for vehicles with factory exhaust systems. Vehicles with aftermarket 4" O.D. exhaust systems will need 2 adapters: C11342x2